Stormonu
NeoGrognard
You're asking for the game to stagnate. It may not always grow in your desired direction, but a game needs to grow to survive. Making D&D into a set of 3 books that never grow, never evolve, and never change is a good way to make D&D die 100x faster.
D&D clearly has many flavors, as you pointed out for Monopoly and Risk. However, where I think the designers fell down is they made the original version (what would be vanilla Monopoly/Risk) unavailable. It would be as if the only version of Monopoly available were Monoply City or for Risk they only made Risk Godstorm.
I applaud Wizards for rereleasing the old 1E, 3E and soon-to-be 2E rulesets. (Wonder if they'll do BECMI and Od&D?)
And while I don't expect, for example, for Windows to contiue to support Win 3.1, 95 or Win 98, I like the fact that not only can I get my hands on games like Diablo III, I can still load up and play something like Pac-man 'cuz someone's packaged it up for use with the latest OS's *.
To me, the best scenario would be where we could get a D&D game generic enough to work with the older editions, yet you can still add on to it. I wish they'd focus moreso on adventures than splatbooks, as splatbooks seem to drive the impetus for new editions that incorporate those "add-ons" into the core.
* Yes, I know Pac-man was an arcade game, but I used to have Revenge of Arcade back for Win95/98 - and besides, it's a great old game.